Accepts blank test in editor value getter/setter

src/simplemde.js

@@ -724,11 +724,11 @@ SimpleMDE.prototype.createStatusbar = function(status) {
  * Get or set the text content.
  */
 SimpleMDE.prototype.value = function(val) {
-	if (val) {
+	if (val === undefined) {
+		return this.codemirror.getValue();
+	} else {
 		this.codemirror.getDoc().setValue(val);
 		return this;
-	} else {
-		return this.codemirror.getValue();
 	}
 };